Reland of "Create rtc::AtomicInt POD struct."

webrtc/base/criticalsection.cc

Index: webrtc/base/criticalsection.cc
diff --git a/webrtc/base/criticalsection.cc b/webrtc/base/criticalsection.cc
index 1f50c2355dbcef57b016f31dcc8c68501b9a84ca..97322f45c9368b64d7f4fae24ca3a5f56aaee260 100644
--- a/webrtc/base/criticalsection.cc
+++ b/webrtc/base/criticalsection.cc
@@ -139,7 +139,7 @@ void GlobalLockPod::Lock() {
   const struct timespec ts_null = {0};
 #endif
 
-  while (AtomicOps::CompareAndSwap(&lock_acquired, 0, 1)) {
+  while (AtomicInt::CompareAndSwap(&lock_acquired, 0, 1)) {
 #if defined(WEBRTC_WIN)
     ::Sleep(0);
 #else
@@ -149,16 +149,13 @@ void GlobalLockPod::Lock() {
 }
 
 void GlobalLockPod::Unlock() {
-  int old_value = AtomicOps::CompareAndSwap(&lock_acquired, 1, 0);
+  int old_value = AtomicInt::CompareAndSwap(&lock_acquired, 1, 0);
   RTC_DCHECK_EQ(1, old_value) << "Unlock called without calling Lock first";
 }
 
-GlobalLock::GlobalLock() {
-  lock_acquired = 0;
-}
+GlobalLock::GlobalLock() : GlobalLockPod({{0}}) {}
 
-GlobalLockScope::GlobalLockScope(GlobalLockPod* lock)
-    : lock_(lock) {
+GlobalLockScope::GlobalLockScope(GlobalLockPod* lock) : lock_(lock) {
   lock_->Lock();
 }